stinky leashes!!

How to keep leashes from smelling like dog?? Our leashes always end up smelling, they are nylon and cotton web leashes. Mainly, it's the cotton web leashes that stink. Any tips on preventing them from smelling or getting rid of the smell?? I hand washed/soaked them with some detergent and that didn't help!!

cotton webbers I place in the washer with tide and line dry or lay in the sun.
Leather I place one drop of all natural shampoo on a damp cloth and run it over it. and line dry.
You can add febreeze to the washer or I love the oxiclean stuff alot.